JP4787994B2 - Magnetic foreign matter removal device - Google Patents

Description

  The present invention relates to a magnetic foreign matter removing apparatus that removes magnetic foreign matter from a granular material or liquid processed material by magnetic adsorption with a magnet.

  Various foreign materials, resin particles for printed circuit boards, inorganic particles for food and medicine, organic particles, etc., or magnetic particles to remove magnetic particles from liquids such as ink and chemicals In this removal apparatus, a magnet is placed close to the powder or liquid transfer path, and magnetic foreign matter is removed from the processed powder or liquid by magnetic adsorption by the magnet. Yes (for example, see Patent Documents 1 and 2).

  In the one described in Patent Document 1, permanent magnets having different poles are arranged alternately in the transfer direction on the back side of the sheet material in the ink transfer path covered with a cylindrical sheet material, and the ink flowing through the transfer path is used. Magnetic foreign matter is removed. Moreover, in what was described in patent document 2, it is the transfer path of the resin granular material formed with the inclination board | substrate, arrange | positioned the several permanent magnet side by side in the transfer direction close to the back side of an inclination board | substrate, and inclined transfer path The magnetic foreign matter is removed from the resin powder particles falling.

  In addition, it does not remove magnetic foreign matter from the processed powder or liquid, but in the middle of the endless transport belt of the semiconductor wafer, a pair of poles of electromagnets are opposed to the top and bottom of the transport belt and adhere to the transport belt. Some magnetic foreign substances are removed by magnetic attraction using an electromagnet (see, for example, Patent Document 3).

Japanese Patent Laid-Open No. 11-78661 (FIG. 1) JP 2000-147134 A (FIGS. 4, 6, and 7) JP-A-10-284571 (FIG. 1)

  As in the magnetic foreign matter removing apparatus described in Patent Documents 1 and 2, the permanent magnet is arranged close to the back side of the transfer path, and the permanent magnet is not so strong in magnetic force. There is a problem that it is necessary to arrange them close to each other and the arrangement form of the transfer path is restricted. In addition, even if the permanent magnets are arranged close to each other as described above, there is a problem in that the magnetic foreign matter contained in the upper layer cannot be efficiently removed when the layer thickness of the granular material or liquid transferred through the transfer path is increased. .

  In order to deal with this problem, it is conceivable that a pair of poles of an electromagnet having a strong magnetic force are opposed to each other above and below the transfer path as described in Patent Document 3, but the magnetic force between the poles of the electromagnet is Since the edge of the pole is the strongest at the position where the edge of the pole faces, the edge of the pole on the upstream side that crosses the transfer path is preferentially attracted magnetically like a weir on the transfer surface of the transfer path. Smooth transfer of powder and liquid processed material is hindered. In this way, if the transfer of the processed material is hindered by the magnetic foreign matter weir, the magnetic foreign matter that has been magnetically adsorbed will be removed even though there is still sufficient adsorption capacity on the transfer surface of the part facing the downstream pole. In order to remove, it is necessary to clean the transfer surface, and there is a problem that the maintenance cycle of the removal device is shortened.

  Accordingly, an object of the present invention is to provide a magnetic foreign matter removing device that can efficiently remove magnetic foreign matters from a granular material or a liquid processed material by magnetic adsorption and can extend a maintenance cycle.

  In order to solve the above-described problems, the present invention is arranged such that a magnet is placed close to a transfer path of a granular or liquid processed material containing a magnetic foreign substance, and the transfer path is transferred by magnetic adsorption by the magnet. In the magnetic foreign matter removing apparatus for removing the magnetic foreign matter contained in the processed material, the magnet is an electromagnet, a pair of poles of the electromagnet are opposed across the entire width of the transfer path, and the opposed surfaces of the opposed poles A configuration in which a plurality of concave portions and convex portions extending in the transfer direction of the processed material is formed is adopted.

  That is, the magnet is an electromagnet having a strong magnetic force, and a pair of poles of the electromagnet are opposed across the entire width of the transfer path, and a plurality of recesses and projections extending in the transfer direction of the processed material on the opposed surfaces of the opposed poles By using a wide range of parts formed with multiple protrusions that increase the magnetic force between the poles, magnetic foreign matter can be efficiently magnetized on the transfer surface of the transfer path or the pole protrusion facing the transfer surface. At the part where the magnetic foreign matter is attracted and removed, and the concave portion extending in the transfer direction in which the magnetic force between the poles is weakened, the magnetic foreign matter is not attracted to the transfer surface so much, and the magnetic foreign matter extends in the transfer direction in which the magnetic foreign matter is not magnetically attracted. The processed material can be smoothly transferred to the site, and the maintenance cycle can be extended.

  The concave portions and the convex portions are formed on both opposing surfaces of the opposed poles, and the concave portions and the convex portions are opposed to each other so that the convex portions are opposed to each other, and are opposed to the transfer surface and the transfer surface. Magnetic foreign matter can be removed by magnetic adsorption on both convex portions of the pole.

  The concave surface and the convex portion are formed on both opposing surfaces of the opposed pole, and the concave surface and the convex portion are opposed to each other, so that the transfer surface of the portion where the convex portion is formed on the pole on the opposite side of the transfer surface and Magnetic foreign matter can be removed by magnetic adsorption on both the transfer surface and the convex portion of the pole facing the transfer surface.

  By inclining or bending some or all of the plurality of convex portions in the direction of transfer of the processed material, the processed material transferred to the portion where the concave portions having weak magnetic force are opposed to each other is also projected on the way. The magnetic foreign substances can be removed more efficiently by passing through the part where the parts face each other.

  By narrowing the width of some or all of the plurality of convex portions on the upstream side in the transfer direction of the processed material, magnetic foreign matter is more easily magnetically attracted at the upstream portion where the convex portions face each other, By reducing the amount of magnetic foreign matter adsorbed on the upstream side, the magnetic foreign matter can be magnetically adsorbed evenly on the downstream side where the convex portions face each other, and the maintenance cycle can be further extended.

  By providing means for imparting vibration to the transfer path, magnetic foreign substances contained in the processed material can be easily brought into contact with each other, and these contacted magnetic foreign substances can be magnetically coupled to be more easily magnetically attracted. .

  The apparatus for removing magnetic foreign matter according to the present invention uses a magnet as an electromagnet having a strong magnetic force, and a pair of poles of the electromagnet are opposed to each other over the entire width of the transfer path. A plurality of recesses and projections extending to the pole, so that a magnetic foreign object can be transferred to the transfer surface of the transfer path or the pole facing the transfer surface by utilizing a wide range of areas where the plurality of projections that increase the magnetic force between the poles is formed. In the part where the concave part extending in the transfer direction where the magnetic force between the poles is weakened is formed, the magnetic foreign substance is not attracted to the transfer surface so much. The processing object can be smoothly transferred through the portion extending in the transfer direction that is not magnetically attracted, and the maintenance cycle can be extended.

  A pole facing the transfer surface and the transfer surface at the part where the protrusions are made to face each other by forming the recesses and the protrusions on both opposing surfaces of the opposed poles and making the recesses and the protrusions face each other. Magnetic foreign matter can be removed by magnetic adsorption on both of the protrusions.

  By forming recesses and projections on both opposing surfaces of the opposed poles, and making the recesses and projections face each other, the transfer surface and transfer of the portion where the projections are formed on the pole opposite to the transfer surface Magnetic foreign matter can be removed by magnetic adsorption on both the surface and the convex portion of the pole facing the surface.

  By inclining or bending some or all of the plurality of convex portions in the direction of transfer of the processed material, the processed material transferred to the portion where the concave portions having weak magnetic force are opposed to each other is also a convex portion having strong magnetic force in the middle. The magnetic foreign substances can be removed more efficiently by passing through the parts facing each other.

  By reducing the amount of magnetic foreign matter adsorbed on the upstream side by narrowing the width of some or all of the plurality of convex portions on the upstream side in the transfer direction of the processed material, the downstream side where the convex portions face each other The magnetic foreign matter can be magnetically adsorbed evenly on the part, and the maintenance cycle can be extended.

  By providing means for imparting vibration to the transfer path, magnetic foreign substances contained in the processed material can be easily brought into contact with each other, and these contacted magnetic foreign substances can be magnetically coupled to be more easily magnetically attracted. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3 show a first embodiment. As shown in FIG. 1, the magnetic foreign matter removing device continuously supplies a processed product of a granular material from a supply device 1 through a guide tube 2 to an inclined trough 3 as a transfer path. Is magnetically applied to the transfer surface 3a of the inclined trough 3 by the magnetic force between the pair of poles 6a and 6b wound with the coil 5 of the electromagnet 4 facing the entire width of the inclined trough 3 in the middle of the inclined trough 3. The granular material from which the magnetic foreign matter has been removed by adsorption is dropped from the inclined trough 3 and collected in the collection container 7. A vibrator 8 for applying vibration is attached to the inclined trough 3, making it easy to contact magnetic foreign substances contained in the granular material transported through the inclined trough 3, and magnetically connecting these contacted magnetic foreign substances to each other. Thus, it is easy to be magnetically attracted to the transfer surface 3a.

  As shown in FIGS. 2 and 3 (a), 3 (b), both poles 6a, 6b of the electromagnet 4 have a plurality of concave portions 9 and convex portions extending in the transfer direction of the arrow A on opposite surfaces facing each other. 10 are formed such that the concave portions 9 and the convex portions 10 face each other. Magnetic foreign matter B contained in the granular material that is transferred while falling on the transfer surface 3a of the inclined trough 3 in the direction of arrow A is the transfer surface at a portion where the convex portions 10 having strong magnetic force between the poles 6a and 6b face each other. 3a and magnetically attracted to the convex portion 10 of the pole 6a facing the transfer surface 3a. Therefore, as shown in FIG. 2, even if the amount of magnetic foreign matter B adsorbed significantly increases, the magnetic force is not applied to the transfer surface 3a at the portion where the recesses 9 having weak magnetic force between the poles 6a and 6b extend in the opposite transfer direction. The foreign matter B is not so much adsorbed, and the granular material can be smoothly transferred through this part.

  4 (a), (b), (c), and (d) show modifications of the facing surfaces of the poles 6a and 6b, respectively. In the modification shown in FIG. 4A, each convex portion 10 is inclined with respect to the transfer direction of the arrow A. Therefore, in this modification, the granular material transferred to the portion where the concave portions 9 having weak magnetic force face each other passes through the portion where the convex portions 10 having strong magnetic force face each other on the way, and the magnetic foreign matter is more efficiently generated. Removed.

  In the modification shown in FIG. 4B, each convex portion 10 is bent outwardly symmetrically in the direction of arrow A transfer. Even in this modification, the granular material transferred to the portion where the concave portions 9 having weak magnetic force face each other passes through the portion where the convex portions 10 having strong magnetic force face each other on the way, and the magnetic foreign matter is more efficiently removed. The

  In the modification shown in FIG. 4C, the width of each convex portion 10 is narrowed on the upstream side in the transfer direction indicated by the arrow A. In this modification, the amount of magnetic foreign matter adsorbed on the upstream side where the width of each convex portion 10 is narrow is reduced, and the magnetic foreign matter is evenly adsorbed even on the downstream side where the convex portions 10 face each other. Can be extended.

  In the modified example shown in FIG. 4D, each convex portion 10 is inclined with respect to the transfer direction indicated by the arrow A, and the width thereof is narrowed on the upstream side in the transfer direction. In this modification, it is possible to obtain both the effect of more efficiently removing the above-described magnetic foreign matter and the effect of extending the maintenance cycle.

  FIGS. 5A, 5B, 5C, and 5D also show modifications of the facing surfaces of the poles 6a and 6b, respectively. The modification shown in FIG. 5A is different from that shown in FIG. 4A in that each convex portion 10 is inclined to the opposite side on the left and right sides of the opposing surfaces of the poles 6a and 6b. The modification shown in FIG. 5B is obtained by bending each convex portion 10 inwardly symmetrically with respect to that shown in FIG. 4B. The modification shown in FIG. In the modified example shown in FIG. 5 (d), each convex part 10 is bent in two positions symmetrically in the transfer direction, and the convex part 10 is made larger than that shown in FIG. 5 (a). It is made to incline and the recessed part 9 in the meantime is partially crossed.

  FIG. 6 shows a second embodiment. The apparatus for removing magnetic foreign matter has the same basic configuration as that of the first embodiment, and includes a plurality of concave portions 9 and convex portions 10 formed on opposing surfaces of both poles 6a and 6b of the electromagnet 4. The difference is that the concave portion 9 and the convex portion 10 are formed to face each other. Therefore, in this embodiment, the magnetic foreign matter B is formed on the transfer surface 3a where the convex portion 10 is formed on the pole 6b opposite to the transfer surface 3a of the inclined trough 3, and the protrusion of the pole 6a facing the transfer surface 3a. It is magnetically attracted to the part 10.

  FIG. 7 shows a third embodiment. In this magnetic foreign matter removing device, a plurality of concave portions 9 and convex portions 10 are formed only on the opposing surface of the pole 6 b opposite to the transfer surface 3 a of the inclined trough 3. In this embodiment, the magnetic foreign matter B is magnetically adsorbed only on the transfer surface 3a where the convex portion 10 is formed on the pole 6b.

  FIG. 8 shows a fourth embodiment. In contrast to the third embodiment, the magnetic foreign matter removing apparatus is formed with a plurality of concave portions 9 and convex portions 10 only on the facing surface of the pole 6a facing the transfer surface 3a of the inclined trough 3. . In this embodiment, the magnetic foreign matter B is magnetically attracted only to the convex portion 10 of the pole 6a.

  In each of the above-described embodiments, the magnetic foreign matter is removed from the processed granular material transferred through the inclined trough. However, the magnetic foreign matter removing apparatus according to the present invention removes the magnetic foreign matter from the liquid processed matter. It can also be applied to a thing, and things other than an inclination trough can also be used for the transfer path.

1 is a longitudinal sectional view showing a magnetic foreign matter removing apparatus according to a first embodiment. FIG. 1 is an enlarged perspective view of a main part of FIG. a is a cross-sectional view of FIG. 2, and b is a plan view showing an opposing surface of the pole of FIG. a, b, c, d are plan views showing modifications of the opposing surfaces of the poles of FIG. a, b, c, d are plan views showing modifications of the opposing surfaces of the poles of FIG. The principal part expanded horizontal sectional view which shows the removal apparatus of the magnetic foreign material of 2nd Embodiment The principal part expanded horizontal sectional view which shows the removal apparatus of the magnetic foreign material of 3rd Embodiment The principal part expanded horizontal sectional view which shows the removal apparatus of the magnetic foreign material of 4th Embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Supply apparatus 2 Guide cylinder 3 Inclined trough 3a Transfer surface 4 Electromagnet 5 Coil 6a, 6b Pole 7 Collection container 8 Vibrator 9 Recessed part 10 Convex part

Claims (5)

A magnet is placed close to the transfer path (3a) of the granular or liquid processed material containing the magnetic foreign matter (B), and the transfer path (3a) is included in the processed object transferred by magnetic adsorption by the magnet. In the magnetic foreign matter removing apparatus for removing the magnetic foreign matter (B), the magnet is an electromagnet (4), and a pair of poles (6a, 6b) of the electromagnet (4) is extended over the entire width of the transfer path (3a). A plurality of concave portions (9) and convex portions (10) extending in the transfer direction of the processing object are formed on the opposing surfaces of the opposed poles (6a, 6b) , and the convex portions (10) A magnetic foreign matter removing apparatus characterized in that a part or all of the width of (10) is narrowed on the upstream side in the transfer direction (A) of the processed product.   The magnetic foreign matter removing apparatus according to claim 1, wherein the concave portion (9) and the convex portion (10) are opposed to both opposed surfaces of the opposed poles (6a, 6b).   The concave portion (9) and the convex portion (10) are formed on both opposing surfaces of the opposed poles (6a, 6b), and the concave portion (9) and the convex portion (10) are opposed to each other. The apparatus for removing magnetic foreign matter according to 1.   The apparatus for removing magnetic foreign matter according to any one of claims 1 to 3, wherein some or all of the plurality of convex portions (10) are inclined or bent in the transfer direction (A) of the processed product. The apparatus for removing magnetic foreign matter according to any one of claims 1 to 4 , further comprising means (8) for applying vibration to the transfer path (3a).

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